Motor-drive



- fecture, will ap or as 1 description of t at embo unent of the insquared for a distance,

UNITED STATESVPATENT OFFICE.

om P. BROGKWAY,

0F TOLEDO, OHIO, ASSIGllClB 1'0 INDUSTRIAL RESEARCH COB-POM- TION, orroutine, OHIO, A conromnon on DELAWARE.

moron-naive.

1,352,112. flpcclficatlon of Letters Patent. Patented Sept. '7, 1920;

Application filed February 14, 1919. Berta] Ho. 276,l950.

To all whom it may concern Be it known that I, CARL P. Bnoonwnr a.citizen of the United States, residing nt 0- ledo, in the county ofLucas and state of Ohio, have invented certain new and useful Imrovements in Motor-Drives, of which I eclare the following to be 9.full, clear, and exact description.

This invention relates to improvements in gearing for use particularlyin starting internal combustion engines.

One object of the invention is the provision of means whereby the jerkymotion of the engine flywheel may be absorbed by a compression spring. A

Another ob ect of'the invention is the provision of'means whereby thejerk absorbing mechanism may be entirely inclosed in order that the samemay be immersedin oil and also to muflle any noise that may to theoperation of the mechanism.

- Other objects, and objects relatin to details of construction andeconomics 0 manuroceed with the vention, which for the purposes ofpresent application, I have illustrated inlthe 8'. companying drawing,in which;

Figure I is a view partly in section and partly in side elevation of astarting gearing embodying my invention,

F i II is a view similar to Fig.1, but with the s nrting gearing in meshwith the engine fly-wheel.

Fi III is a cross section taken on the line.

II'L- II Fi I. Similar reerende characters refer to siniilarM'partsthroughout 7 invention is intended primarily for.

the views;

use in that classof gas engine starters, in

wheel comes from an electr c motor, and have indicated a fragrnentjofsuch a motor at 10 in the drawing. The motor shaft 11 protrudes "somedistance from the and of the motor and in the embodiment of theinvention illustrated, is unsupported except by the motor bearings Justoutside the motor a collar 9 is fixed'to the shaft. The letter at aboutmidway of its exposed ortion is as at 12, provide for longitudinalmovement thereon of a sleeve 13 which has a correspondingly iorined beincident opening therethrongh, the dimensions being such as to produce aloose sliding fit.

Beyond the squsredpo'rtiou 12 of the shait the latter is turned down toform a portion 14 which is of still smnllericircnlor cross section. Itcarries a compression spring 15, hearing at one end against a washer 16,which rests against the adjacent end of the sleeve 13. The opposite endof the spring bears against a cup alleged washer 17, resting against theco lar 1 which is movable along the shaft in order to adjust the tensionof the spring, said movement being eil'ected 'hvmeans of a. nut 19,threaded upon the end of the shaft and locked in an one ofvariouspositions by means of a 100 nut 20, which, if desired, may beheld in place b a cotter pin 21 penetrating registering ho es in the nutand shaft.

The sleeve 13 is exteriorl shown in the drawing to fit t e correslidingly threaded interiorsurface of a cy nder 2, which carries on itsforward end a drive" wheel-23, preferably a pinion adagted to mesh. withteeth 24 on a flyheel 2 of an internal combustion engine. In order toproducf' a. tendency in the cylinder and pinion against motion ofrotation I may secure to i the cylinder or to the pinion a disk 26 uponthreaded as der and the ring 28 should be oil tight. In

the invention uch ii an embodiment of where the outer end shown in thedrawing of the motor shait is unsupported, I refer to close the outerextremity of the o3] inder by means of a screw cap 30 pricking 81 beinecessary to mekcthe joint oil tight. collar 18 is of a size to rov do asmooth sliding lit with the am interior vgell of the outer end of thecglinder, one or qjnoro 30 openi or grooves B through the collar,providm agem for o1l. as tho move bar: on fort l0ngltfld1 n|l11h h inderand that it is desired to start the same, and assuming that the startinggearing IS in the maiden illustrated at Fig. I the motor 10 18 set inoperation, turn' the shaft 11 in the direction of the arrow F ig. I.

The sleeve 13. turns with the e aft because of the uared connectionbetween the two parts. i he cylinder 22 however, because of the weight27, possesses a tendency against rotation. Conse uently it remains inthe upright position illustrated in the drawing and is moved forwardtoward the motor by the action of the screw threaded sleeve 13 upon itsown interiorl'y screw threaded surface. During this forward movement,teeth on the pinion 23 mesh with some of the flywheel teeth 24. There isno tendency to turn the fiywvheel however, until the longitudinalmovement of the c linder is stopped by the collar 9. Then, alt ough theforward movement of the cylinder IS interrupted, there is still possiblea relative motion between the cylinder and sleeve because of the factthat the sleeve may move outward-upon the shaft. Slltll motion isopposed by t e spring 15, and if there were no inertia in the fly-wheelto be overcome, it would not take place, but the cylinder would turnwith the sleeve to rotate the fiy-whcel. However, due to the weight ofthe fly-wheel and the friction in the engine as well as the compressionin its cylinders, the inertia of the fly-wheel offers a resistance torotation which is greater than the resistance of the spring 15 againstcompression. Accordingly, further rotation oi the shaft forces thesleeve 13 back'against the resistance of the spring until thatresistance becomes greater than the resistance of the fly-wheel. afterwhich the cylinder turns and rotates the fiy-whcel.

llhilr the engine is luring: turned over by the starting motor therotation of the flywheel is irregular or jerky, because it is slowed upby the compression strokes ol the pistons in the various cylinders, andre wives a sudden forward impulse each time that a piston starts downafter u compros sion stroke. In my mnstrurtion, whenever [hero is aretardation of the rotation of the ily-whvvl, the added resistance torotation, transmitted to cylinder 22 from the flywheel, causes thesleeve 13 to move outward, compressing the spring 15 and storing; upenergy therein. lihcn that particular romprossion stroke is completed,the energy thus stored up in the spring is expendedy-movinu the sleeveforward again, thereby adding slightly for a brief instant to theispcodof rotation of the cylinder over that fwhirh is produced by the rotationof the motor shaft.

.motor shaft and the sleeve 13, whereupon relative motion between thesleeve 13 and cylinder 22 must take place, and accordingly the cylinder22 moves rapidly hackwar from its position of Fig. I to that of am awarethat the particular embodiment of my invention above described, andillustrated in the accompanying drawing, is susce tible of considerablevariation without eparting from the spirit thereof, and therefore Idesire to claim my invention broadly as Well as specifically asindicated by the appended claims I claim as my invention:

1. In combination with a motor driven shaft having a free extremity, acylinder mounted upon said shaft, means within the cylinder operetivelyconnected with the s aft for imparting a limited longitudinal movementto said cylinder, said means at the termination of said longithdinalmove ment locking the shaft and cylinder together rotatably saidcylinder being closed at its outer end and having an oil tight bearingupon the shaft at its inner end, and a driving wheel mounted upon saidcylinder.

2. In combination with an engine flywheel, a motor driven shaft, asleeve mounted upon said shaft non-rotatebly but ca able of a slightlongitudinal movement wit respect thereto, a cylinder surrounding saidsleeve and shaft closed at one end and havin a screw thread connectionwith said sleeve, a pinion fixed to the other end of said cylinder andadapted to drive said flywheel, and resilient means for limiting thelongitudinal movement of said sleeve.

3. In combination with a motor driven shaft having a free extremity, asleeve mouutiul upon said shaft non'rotehihlv, a cylinder surroundingsaid sleeve andshat't and having a screw threaded connection with saidsleeve, a drive wheeliixed to said cylinder, said cylinder beinginclosed at its outer end and having an oil tight hearing on the shaftat its inner end, said sleeve being provided with an oil passageextendinglongitudinally therethmugh.

In testimony whereof, I allix my signature.

CARL P. BROGKWAY.

